/// <summary>
            /// Fetches the delivery options applicable for the item/inventDimId and Address.
            /// </summary>
            /// <param name="request">The request.</param>
            /// <returns>Delivery options applicable.</returns>
            /// <remarks>This API is typically used to display the delivery options in Item details page.</remarks>
            private static GetProductDeliveryOptionsServiceResponse GetProductDeliveryOptions(GetProductDeliveryOptionsServiceRequest request)
            {
                if (request.ShippingAddress == null)
                {
                    throw new ArgumentNullException("request", "request.ShippingAddress");
                }

                var dataServiceRequest = new GetItemDeliveryOptionsDataRequest(request.ItemId, request.InventoryDimensionId, request.ShippingAddress.ThreeLetterISORegionName, request.ShippingAddress.State);

                dataServiceRequest.QueryResultSettings = request.QueryResultSettings;
                var dataServiceResponse = request.RequestContext.Execute <EntityDataServiceResponse <DeliveryOption> >(dataServiceRequest);

                var deliveryOptions = dataServiceResponse.PagedEntityCollection;

                // Raise notification if no delivery options are found.
                if (!deliveryOptions.Results.Any())
                {
                    EmptyProductDeliveryOptionSetNotification notification = new EmptyProductDeliveryOptionSetNotification(request.ShippingAddress, request.ItemId, request.InventoryDimensionId);
                    request.RequestContext.Notify(notification);
                }

                return(new GetProductDeliveryOptionsServiceResponse(deliveryOptions));
            }
            /// <summary>
            /// Gets the item delivery options.
            /// </summary>
            /// <param name="request">The request.</param>
            /// <returns>The response with the delivery options.</returns>
            private EntityDataServiceResponse <DeliveryOption> GetItemDeliveryOptions(GetItemDeliveryOptionsDataRequest request)
            {
                var shippingDataManager = this.GetDataManagerInstance(request.RequestContext);
                var deliveryOptions     = shippingDataManager.GetItemDeliveryOptions(request.ItemId, request.VariantInventoryDimensionId, request.CountryRegionId, request.StateId, request.QueryResultSettings);

                return(new EntityDataServiceResponse <DeliveryOption>(deliveryOptions));
            }